The old woman’s eyes are just two gaping holes filled with empty air,with the hills and the sky.Then the cracks begin around her eyes ,spreading beyond her skin and then the hills crack, the temples crack and the sky cracks and the the sky finally shatters and falls like plate-glass. The old woman herself is shatter-proof and nothing happens to her .Only you get instantly reduced to small change in her hand .It is you who shatter because her eyes are already bullet-holes which are formed with the cracks around the holes.

How right you are !Like you said,the start is a plain narration and as the theme builds up there comes a brilliant image,which contrasts the poet’s own fragility with the old woman’s “shatter-proof”ness. Thanks for the comments.